1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
9 -- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the VxWorks version of this package.
36 -- Make a careful study of all signals available under the OS,
37 -- to see which need to be reserved, kept always unmasked,
38 -- or kept always unmasked.
39 -- Be on the lookout for special signals that
40 -- may be used by the thread library.
44 with System
.OS_Interface
;
45 -- used for various Constants, Signal and types
47 package body System
.Interrupt_Management
is
49 use System
.OS_Interface
;
50 use type Interfaces
.C
.int
;
52 type Signal_List
is array (Signal_ID
range <>) of Signal_ID
;
53 Exception_Signals
: constant Signal_List
(1 .. 4) :=
54 (SIGFPE
, SIGILL
, SIGSEGV
, SIGBUS
);
56 Exception_Action
: aliased struct_sigaction
;
57 -- Keep this variable global so that it is initialized only once
59 procedure Map_And_Raise_Exception
(signo
: Signal
);
60 pragma Import
(C
, Map_And_Raise_Exception
, "__gnat_map_signal");
61 -- Map signal to Ada exception and raise it. Different versions
62 -- of VxWorks need different mappings.
64 -----------------------
65 -- Local Subprograms --
66 -----------------------
68 function State
(Int
: Interrupt_ID
) return Character;
69 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
70 -- Get interrupt state. Defined in init.c
71 -- The input argument is the interrupt number,
72 -- and the result is one of the following:
74 Runtime
: constant Character := 'r';
75 Default
: constant Character := 's';
76 -- 'n' this interrupt not set by any Interrupt_State pragma
77 -- 'u' Interrupt_State pragma set state to User
78 -- 'r' Interrupt_State pragma set state to Runtime
79 -- 's' Interrupt_State pragma set state to System (use "default"
82 procedure Notify_Exception
(signo
: Signal
);
83 -- Identify the Ada exception to be raised using
84 -- the information when the system received a synchronous signal.
86 ----------------------
87 -- Notify_Exception --
88 ----------------------
90 procedure Notify_Exception
(signo
: Signal
) is
91 Mask
: aliased sigset_t
;
94 pragma Unreferenced
(Result
);
97 Result
:= pthread_sigmask
(SIG_SETMASK
, null, Mask
'Unchecked_Access);
98 Result
:= sigdelset
(Mask
'Access, signo
);
99 Result
:= pthread_sigmask
(SIG_SETMASK
, Mask
'Unchecked_Access, null);
101 Map_And_Raise_Exception
(signo
);
102 end Notify_Exception
;
104 ---------------------------
105 -- Initialize_Interrupts --
106 ---------------------------
108 -- Since there is no signal inheritance between VxWorks tasks, we need
109 -- to initialize signal handling in each task.
111 procedure Initialize_Interrupts
is
113 old_act
: aliased struct_sigaction
;
115 for J
in Exception_Signals
'Range loop
118 (Signal
(Exception_Signals
(J
)), Exception_Action
'Access,
119 old_act
'Unchecked_Access);
120 pragma Assert
(Result
= 0);
122 end Initialize_Interrupts
;
128 Initialized
: Boolean := False;
130 procedure Initialize
is
131 mask
: aliased sigset_t
;
140 -- Change this if you want to use another signal for task abort.
141 -- SIGTERM might be a good one.
143 Abort_Task_Signal
:= SIGABRT
;
145 Exception_Action
.sa_handler
:= Notify_Exception
'Address;
146 Exception_Action
.sa_flags
:= SA_ONSTACK
;
147 Result
:= sigemptyset
(mask
'Access);
148 pragma Assert
(Result
= 0);
150 for J
in Exception_Signals
'Range loop
151 Result
:= sigaddset
(mask
'Access, Signal
(Exception_Signals
(J
)));
152 pragma Assert
(Result
= 0);
155 Exception_Action
.sa_mask
:= mask
;
157 -- Initialize hardware interrupt handling
159 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
161 -- Check all interrupts for state that requires keeping them reserved
163 for J
in Interrupt_ID
'Range loop
164 if State
(J
) = Default
or else State
(J
) = Runtime
then
169 -- Add exception signals to the set of unmasked signals
171 for J
in Exception_Signals
'Range loop
172 Keep_Unmasked
(Exception_Signals
(J
)) := True;
175 -- The abort signal must also be unmasked
177 Keep_Unmasked
(Abort_Task_Signal
) := True;
180 end System
.Interrupt_Management
;